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#include <fstream>
#include <vector>
using namespace std;
ifstream cin("dfs.in");
ofstream cout("dfs.out");
vector<int>v[100005];
bool viz[100005];
int n,m,a,b;
void dfs(int nod)
{
viz[nod]=1;
for(int i=0;i<v[nod].size();i++)
if(!viz[v[nod][i]])
dfs(v[nod][i]);
}
int main()
{
ios_base::sync_with_stdio(0);
cin>>n>>m;
for(int i=1;i<=m;i++)
{
cin>>a>>b;
v[a].push_back(b);
v[b].push_back(a);
}
int s=0;
for(int i=1;i<=n;i++)
if(!viz[i])
{
s++;
dfs(i);
}
cout<<s;
return 0;
}